Experimental Investigation of Basic Mechanical Properties of Self-Compacting Recycled Aggregate Concrete

In order to study the basic mechanical properties of the self-compacting recycled aggregate concrete（SCRAC）, the cubic compressive strength test, the axial compressive strength test, the splitting tensile strength test, and the elastic modulus test were carried out. The failure process and the failure mode of the SCRAC under compression and tension were observed. The effects of the recycled coarse aggregate（RCA）replacement ratio on the basic mechanical properties of the SCRAC were analyzed. The applicability of the conversion relationship between each mechanical property index of the ordinary concrete and the recycled aggregate concrete to the SCRAC was discussed. The test results show that the failure mode of the SCRAC under compression and tension is similar to that of the ordinary concrete. The test results also show that the cubic compressive strength, the axial compressive strength, the splitting tensile strength, and the elastic modulus of the SCRAC decrease by 15.5%, 12.7%, 25.6%, and 11.5%, respectively, and the peak strain of the SCRAC increases by 19.8%, when the RCA replacement ratio increases from 0 to 100%. The test results also demonstrate that RCA replacement ratio has no significant effect on the Poisson ratio of the SCRAC. The research findings indicate that the conversion relationship between each mechanical property index of the ordinary concrete and the recycled concrete is not applicable to the SCRAC, and the proposed conversion relationship between the cubic compressive strength and the other mechanical property indices of the SCRAC has high precision.